Blowpipe.



C. H. PEAKE.

BLOWPIPE.

APPLICATION FILED AUG. 28, 1912.

Patented May 19, 1914.

UNITED STATES PATENT OFFICE;

CARL H. PEAKE, OF DETROIT, MICHIGAN, ASSIGNOR 0F ONE-HALF T0 ALBERTGROH, OF DETROIT, MICHIGAN.

BLOWPIPE.

Specification of Letters Patent.

Patented May 19, 1914.

Application filed August 28, 1912. Serial No. 717,417.

To all whom it may concern Be it known that I, CARL H. PEAKE, a citizenof the United States of America, residing at Detroit, in the county ofWayne and State of Michigan, have invented certain new and usefulImprovements in .Blowpipes, of which the following is a specification,reference being had therein to the accompanying drawings.

In gas burning blow pipes, it is found that the intensity of' the heatdeveloped, is in direct proportion to the velocity of the air and thevolume of gas consumed.

The object of this invention is to provide a blow pipe constructionwhich is such that a very high air pressure may be used, a largeconsumption of gas per unit of time, secured, and perfect combustionmaintained, insuring a regulable, concentrated and intensely hot flame.

To these ends the invention consists in the matters hereinafter setforth and more particularly pointed out in the claims, reference beinghad to the accompanying drawing in which- Figure 1 is a longitudinalsection through the head or burnerend of a blow pipe embodying theinvention; Fig. 2 is a similar view of the inlet end of the same; saidFigs. l and 2 together forming a complete sectional view of the device;Fig. 3 is an end elevation of Fig. l; and Fig. l, a transverse sectionon the line IV-IV of Fig. 1.

Air under pressure is supplied from any suitable source, through asupply pipe 1 having a .suitable valve 2 for regulating the flow, andgas is supplied through a supply 3 which is also provided with asuitable valve 4c for regulating the flow. These supply pipes arescrewthreaded to engage screwthreaded openings in a suitable couling orcasing 5 which is formed with a wall 6 extending across the passagewithin which the air pipe 1 is secured. This wall is formed with ascrewthreaded opening to receive a small jet tube 7 which extendsoutward through the discharge end of the coupling 5 in the axis thereofand in the axis of a mixing tube or pipe 8 which is screwthreaded at oneend to engage the screwthreaded discharge end 9 of the coupling. Theopposite end of the tube 8 is screwthreaded to engage a screwthreadedopening in the end of a burner head 10, and the The burner head ispreferably cylindrical in form and provided with an axial passage 1lextending therethrough and forming a continuation of the mixing tube,said passage being preferably contracted slightly toward its opendischarge end 12. An annular chamber 13 is formed in the head around thepassage 11 and this chamber communicates with the passage 11 through aseries of openings 14; formed in the wall of the passage. The end wall15 ofthe chamber 13 is formed with a plurality of small openings 16arranged around the main discharge end 12 of the main passage so thatgas entering the chamber 13 through the openings 14, may pass outthrough the openings 16 and form a plurality of small jet flames aroundthe main jet issuing from the opening 12.

By arranging the air jet in the mixing tube with its discharge end atsome distance from the burner head, the air issuing from the jet tube isthoroughly mixed in the tube 8 with a large percentage of gas which isdra-Wn in around the tube 7 by the force of the jet of air. The burnerhead is thus provided with a combustible mixture of` gas and air, someof which will be driven by the air pressure, laterally intothe annularchamber 13 and maintain a series of small jet flames around the main et.A very high air pressure may therefore be used, as the iiame of the mainjet will be maintained by the small jets around it, and the higher theair pressure, the more gas will be forced through the small jetopenings. The pressure of the gas in the chamber 13 will be much lowerthan the pressure in the passage 11, but it will be sufficient at alltimes to cause the gas to issue from the openings 16 and form anauxiliary supply for the main flame. A large volume vof gas is thussupplied to the main jet, 'iving a very hot flame which is maintaine an(concentrated by the very high air pressure.

Obviously, changes may be made in the construction and arrangement ofparts withtion and I do not wish to limit myself to the particularformor construction shown.

Having thus fully described my invention what I claim is 1. In a blowpipe, the combination with a mixing tube having a coupling at one endthereof for airv and gas connections, and a jet tube carried by thecoupling of said mixing tube and extending longitudinally along saidmixing tube, of a burner head carried by the opposite end of said mixingtube and comprising a member having a longitudinal tapering passage withthe walls of said passage representing a continuation of the inner wallsof said mixing tube, said member having circumferentially arrangedopenings ladjacent to the end of said mixing tube, a peripheral flangecarried by the outer end of said member and rovided withcircumferentially arranged ibng'tudinal openings, and a sleeve mountedupon said member and the flange thereof vand providinof an annularchamber between the outer walls of said member and the inner walls ofsaid sleeve.

2. In a blow pipe, the combination with a mixing tube having a couplingat oneend thereof for air and gas connections, of a burner head at theopposite end of said mixing tube, a jet tube carried by the coupling ofsaid mixing tube and extending in proximity to said burner head andproviding a mixing chamber at said head, said burner head comprising amember having a longi- `tudinal tapering passage with the walls. of saidpassage representing a continuation of the walls of'said mixing chamber,said member having circumferentially arranged openings adjacent to theend of said mixing tube and in communication with the mixin chamberthereof, a peripheral flange carrie by the outer end of said member andprovided with eircumferentially arranged longitudinal openings, and asleeve mounted upon said member and the flange thereof and providin anannular chamber between the outer wal s of said member and the innerwalls of saidsleeve.

In testimony whereof I aiix my signature in presence of two witnesses.

Witnesses: v' Lnwis E. FLANDERS, ANNA M. SHANNON.

'CARL n; PEAKE.

